> which is still 400 points or so behind apple silicon for a much higher clock speed and a multiplier larger power draw

Not a fair comparison. If we're on about Geekbench as per the announcement, it's +35%. The 15% is a geomean. It might not be better but definitely not far off Apple.

In a similar manner, except Geekbench the geomean of M3 vs M4 isn't that great either.